David g



(No Model.)

D. o LOGKWOO'D. MARTINGALE RING OF GELLULOID OR OTHER PLASTIC MATERIAL.

No. 276,435. Patented A r.24., 1883.

\N'ITNEEEEE- j INVENTUF:

N. PEIERS, PlMo-Lillw raphv. Wzshinglun, n. c.

UNITED- STATES FFICE.

PATENT DAVID 0.. LOGKWOOD, OF NEWARK, N. J., ASSIGNOR TO THERUBBER ANDGELLULOID "HARNESS TRIMMING COMPANY, OF SAME PLACE.

MARTINGALE-RING OF CELLULOID OR OTHER PLASTIC MATERIAL.

SPECIFICATION formingpart of Letters Patent No. 276,435, dated April 24,1883,

Application filed November 28, 1882. (No model.)

To all whom it may concern Be it known that I, DAVID C. LOCKWOOD, acitizen of the United States, residing at Newark, in the county of Essexand State of New Jersey, have invented certain new and usefulImprovements in Martingale-Rings of Uelluloid or other Plastic Material;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being badto the accompanying drawings, in which-- I Figure lshows a perspectiveview ofa blank, and Fig. 2 the finished ring.

The invention has relation to improvements in the manufacture ofarticles of plastic material, and is especially adapted to theproduction of what are known as martingale-rings.

I contemplate its use particularly in connection with articles made ofcompounds of pyroxyline, and especially the article known as celluloid;which I have used with the best results.

The invention consists essentially in utilizing a piece or section ofrod of such length that'it will form, when its ends are united, a ringof the desired diameter.

1n the accompanying drawings the nature 0 of the invention is clearlyillustrated.

A is a section or piece of rod, which will be formed in any convenientway. At its ends are formed the holes or apertures a a, which are of asuitable size and shape to accommo- 5 date the dowel-pin G. The pin 0 isintroduced into the hole or aperture a, after which the piece of rod isbent and the projecting end of the dowel-pin introduced into the hole oraperture a, after which the ring is COLU- "4o pleted by means of a dieor mold in the customary manner.

The invention is particularly useful in connection with the manufactureof rings from compounds of pyroxyline, although it may be used in theproduction of rings from other plastic material. I

The dowel-pin may be made of the same material as the ring or othermaterials, according to circumstances, although, as stated, I

prefer to use a pin of the same material as that out of which thearticle is made.

In certain Letters Patent granted to me on the 20th day of December,1881. and which are numbered 251,258 and 251,259, I have describedcertain methods of manufacturing hollow and solid rings of plasticmaterial, to the former of which methods the present in.- vention isanalogous, the principal difference being that in the present instance Imake use of a solid rod and manipulating the section of rod that I amenabled to efiect the desired result very much in the same manner as isdescribed in the patents last aforesaid.

In my present invention I take a rod of plastic material ofanyappropriate size, which I cut into sections of such length that whenthe ends are united they will form a ring of the desired diameter. Ithen provide the ends of the pieces of rod with suitable holes orapertures, in one of which a dowel-pin, preferably of the same materialas the ring, is introduced. being of a sufficient length to operate tohold the ends of the section of rod securely together after the materialhas been subjected to the action of the mold. The dowel-pin having beenintroduced, the blank or section of rod is manipulated 'to form a ring,the dowel-pin being introduced into the hole or aperture in the oppositeend of the blank or section of rod. The partially-formed ring is thenintroduced into a die or mold of appropriate construction and the ringcompleted by heat and pressure, according to methods well understood inthe art to which the invention relates. After the ring has been left inthe die sufficiently long to have become thoroughly set, it is removedand placed upon a hub and permitted to dry, when it will be found tohave all the characteristics of a perfectly solid ring. 0

In practicing the invention the material will be by preferencemanipulated 'while it is in a semi-plastic condition, as considerableincon venience will be experienced if it is permitted to harden. 5

What I claim as my invention is-- The process herein described offorming solid rings of plastic material, which consists produce a solidring by so 60 I in, first, forming a section ofrod of such length Intestimony whereof I affix my signature in. that; it will form when itsends are united a presence of two witnesses. ring of any given diameter;second, providing the ends of the rod with holes to aecommo- DAVID C.LOOKWOOD. 5 date a dowel-pin; third, introducing a dowelpin andmanipulating the section of rod to Witnesses: forman unfinished ring;fourth, finishing the CHAS. (J. GILL, ring in a die, substantially asset forth. HERMAN GUSTOW.

